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Topological and geometrical effects in complex nanostructures

Organisers
  • Vladimir Fomin
  • Feodor Kusmartsev

Keywords: Topological effects, Complex geometries, Nanoarchitectures

Our Mini-colloquium is devoted to novel electronic, magnetic, optical and transport properties of nanostructures. with complex geometry and non-trivial topology emerging due to the modern advances of high-tech fabrication techniques [1]. We intend to highlight the present state and perspectives of the key pathways in fabrication of complex 3D nanoarchitectures: roll-up self-organization and direct-writing techniques
using focused electron-beam or focused ion-beam induced deposition. We expect to exchange views on diverse ongoing experimental and theoretical efforts towards understanding and engineering of their properties, which open up unprecedented potentialities for design, functionalization and integration of nanodevices. Among representative topics, we will discuss (i) how the topological transitions between vortex
and phase-slips regimes in curved superconductor nanomembanes are governed by the geometry and the external stimuli (Fig. 1) and (ii) the localization phenomena in multilayer structures with nanoparticles when the electron mean free path is compared
to the interatomic distance (Fig. 2).


Figure 1: Open Nb nanotube embedded into the heatsink (a). Average voltage induced at different transport currents (in GA/m2) in the magnetic field B, which is switched on gradually (b) and abruptly (c). reflects vortex regime and phase-slip regimes, correspondingly. Insets: patterns of the complex order parameter (white regions encode superconducting state ; colours encode phase of the superconducting order parameter). [2]

Figure 2. The dc resistance R of the multilayer film samples (Ta–FeNi)N (inset) including nanoiland FeNi layers. With an increase in the FeNi layer thickness 1.0 (a), 1.5 (b), 2.0 (c) and 4.0 nm (d), R as a function of memperature changes from the non-metallic (a,b) to metallic (c,e) behaviour due to appreciable coalescence of FeNi nanoislands in the layer with the thickness above the percolation threshold. [3]
References

[1] V. M. Fomin, Self-rolled micro- and nanoarchitectures: Effects of topology and geometry, De Gruyter, Berlin/Boston, 2021, 148 p.
[2] I. Bogush, V. M. Fomin, arXiv:2110.12745v1 [cond-mat.supr-con] (2021).
[3] N. N. Kovaleva, F. Kusmartsev, A. B. Mekhiya et al.,Scientific Reports, 10, 21172 (2020).

Key dates

Early registration deadline:

5 June 2022

Registration deadline:

21 July 2022


Exhibition

The programme is complemented by a large physics and physics instrumentation exhibition proposed by the conference’s partners. If you wish to exhibit at this conference, you can find more information here.


Jointly organised by the EPS and IOP